dom/canvas/test/webgl-mochitest/test_without_index_validation.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <meta charset='utf-8'>
   5 <title>WebGL test: Drawing without index validation</title>
   6 <script src='/tests/SimpleTest/SimpleTest.js'></script>
   7 <link rel='stylesheet' href='/tests/SimpleTest/test.css'>
   8
   9 <script id='vertSource' type='none'>
  10 void main(void) {
  11   gl_PointSize = 1.0;
  12   gl_Position = vec4(0, 0, 0, 1);
  13 }
  14 </script>
  15
  16 <script id='fragSource' type='none'>
  17 precision mediump float;
  18
  19 void main(void) {
  20   gl_FragColor = vec4(0, 1, 0, 1);
  21 }
  22 </script>
  23 </head>
  24 <body>
  25 <script>
  26
  27 function test() {
  28   const c = document.createElement('canvas');
  29   c.width = c.height = 1;
  30   const gl = c.getContext('webgl');
  31   if (!gl) {
  32     todo(false, 'WebGL is unavailable.');
  33     return;
  34   }
  35   document.body.appendChild(c);
  36
  37   const vs = gl.createShader(gl.VERTEX_SHADER);
  38   gl.shaderSource(vs, vertSource.innerHTML.trim());
  39   gl.compileShader(vs);
  40   const fs = gl.createShader(gl.FRAGMENT_SHADER);
  41   gl.shaderSource(fs, fragSource.innerHTML.trim());
  42   gl.compileShader(fs);
  43   const prog = gl.createProgram();
  44   gl.attachShader(prog, vs);
  45   gl.attachShader(prog, fs);
  46   gl.linkProgram(prog);
  47   gl.useProgram(prog);
  48
  49   gl.clearColor(1,0,0,1);
  50   const pixel = new Uint32Array(1);
  51   const pixelData = new Uint8Array(pixel.buffer);
  52
  53   function expectPixel(expected, info) {
  54     gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixelData);
  55     ok(pixel[0] == expected,
  56        '[' + info + '] Expected 0x' + expected.toString(16) + ', was 0x' + pixel[0].toString(16));
  57   }
  58
  59   gl.clear(gl.COLOR_BUFFER_BIT);
  60   expectPixel(0xFF0000FF, 'Clear');
  61
  62   gl.drawArrays(gl.POINTS, 0, 1);
  63   expectPixel(0xFF00FF00, 'DrawArrays');
  64
  65   const indexBuffer = gl.createBuffer();
  66   gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
  67   gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0]), gl.STATIC_DRAW);
  68
  69   gl.clear(gl.COLOR_BUFFER_BIT);
  70   gl.drawElements(gl.POINTS, 1, gl.UNSIGNED_SHORT, 0);
  71   expectPixel(0xFF00FF00, 'DrawElements');
  72
  73   SimpleTest.finish();
  74 }
  75
  76 SimpleTest.waitForExplicitFinish();
  77
  78 const prefArrArr = [
  79   ['webgl.force-index-validation', -1]
  80 ];
  81 const prefEnv = {'set': prefArrArr};
  82 SpecialPowers.pushPrefEnv(prefEnv, test);
  83
  84 </script>
  85 </body>
  86 </html>